Republican nominee Donald Trump said on Monday he would work closely with NATO allies to defeat Islamic State militants if he wins the White House, reversing an earlier threat that the U.S might not meet its obligations to the Western military alliance. In a major speech in Ohio, Trump sought to recreate the strongman persona that powered his political rise. The Republican nominee, reeling from self-inflicted wounds that played into his rival Hillary Clinton's charge that he lacks the temperament to be commander in chief, promised an all-encompassing struggle with Islamic terror modeled on the Cold War. Trump also called for shutting down access to the internet and social media for those aligned with Islamic State, which holds territory in Syria and Iraq.